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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6aede4e6b0f87196d3f71a8b6bf63e0be1b53ebdcf7b313463bd3a2ba3a9d1' 
  AND token = 'UBFNHY/ry1McbcuEGzOPgc8BLHCP4lBAfTFHyVDhcEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}